Given natural selection is true, why do we still have genetic eye sight issues? Because I would think bad eye sight would get you killed (or at least the inability to eat) in a hunter gatherer society.
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It turns out that average eyesight (20/20, meaning you can see clearly at 20 feet what the average person can see clearly at 20 feet) just isn’t as critical an ability as our intuition suggests, that’s all. For most survival-related circumstances, fuzzy vision is perfectly adequate. I can’t think of a single scenario (apart from one purposefully contrived to erase the difference between ‘bad eyes’ and ‘no eyes’) where it would cause an “inability to eat” in any social animal, least of all one with consciousness and the related ability to communicate (in contrast to mere ‘signaling’) which humans have.
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